Resident Evil 4, RE Remake, RE Outbreak, and Godhand Signed by Shinji Mikami
Yakuza O, Kiwami, Kiwami 2, and the Collection signed by Toshihiro Nagoshi
Metal Gear Solid Collection signed by Hideo Kojima
Modern Warfare 2 signed by Jason West and Vince Zampella
Streets of Rage 2 Signed by Yuzo Koshiro
Edit:
Fucking forgot so many that came to mind after post:
Dark Souls and Bloodborne by Miyazaki
Max Payne 1 and 2 signed by Sam Lake
No More Heroes 1 & 2 Signed by Suda51
Deadly Premonition signed by Swery
Gears 1 signed by Cliffy B and Rod Fergusson
FF7 Signed by Kitase